// This script will output a randomized portal banners per session.

function getCookie(Name) {
	var search = Name + "=";
	if (document.cookie.length > 0) {
		offset = document.cookie.indexOf(search)
		if (offset != -1) {
			offset += search.length
			end = document.cookie.indexOf(";", offset)
			if (end == -1)
				end = document.cookie.length
			return unescape(document.cookie.substring(offset, end))
		}
	}
}

var imgNum = getCookie("NYCbannerNum");
var cookiePath = location.pathname;
var imgSplit = "";

cookiePath = cookiePath.substr(0,(cookiePath.indexOf("/html/") + 6));

var bannerList = new Array(
	"banner_bnx_skyline.jpg|Skyline in front of Bronx Courthouse. Photographer: Andrew Clarke",
	"banner_brkln_boroughhall.jpg|Brooklyn Borough Hall, Brooklyn",
	"banner_brklyn_bridgenight.jpg|Brooklyn Bridge",
	"banner_brkln_museum.jpg|Brooklyn Museum, Brooklyn. Photo Credit: AP PHOTO/ Dean Cox",
	"banner_bkn_prospect_carousel.jpg|Prospect Park Carousel, Brooklyn. Photographer: Ted Levin",
	"banner_man_park.jpg|Central Park, Manhattan",
	"banner_man_centralpkfoliage.jpg|Central Park, Manhattan. Photo Credit: NYC & Company",
	"banner_man_amnh.jpg|American Museum of Natural History - Rose Center, Manhattan. Photo Credit: Digial Vision CD",
	"banner_man_midtownnight.jpg|Midtown Skyline, Manhattan. Photographer: Bart Barlow",
	"banner_m_carriage.jpg|Carriages Along Central Park, Manhattan. Photo Credit: Katie Klith",
	"banner_man_uws.jpg|Riverside Park, Manhattan. Photographer: Jeff Greenberg",
	"banner_qns_flushingmdw.jpg|Flushing Meadow Park, Queens. Photo Credit: Geraldine Sweeney",
	"banner_qns_flushingmdw2.jpg|Flushing Meadow Park, Queens. Photo Credit: Geraldine Sweeney",
	"banner_si_stgeorge.jpg|St. George, Staten Island. Photo Credit: Bill Paciello",
	"banner_verrazano.jpg|NYC Marathon, Verrazano Bridge");
	
if (imgNum == "" || imgNum == null || isNaN(imgNum)) {
	imgNum = Math.round(((bannerList.length -1) * Math.random()) + 1) - 1;
	if(document.cookie.length > 0) {
		document.cookie = "NYCbannerNum=" + imgNum + ";path=" + cookiePath + ";" + document.cookie;
	} else {
		document.cookie = "NYCbannerNum=" + imgNum + ";path=" + cookiePath + ";";
	}
}

imgSplit = bannerList[imgNum].split("|");
document.write('<img src="http://www.nyc.gov/portal/images/headers/nycgov/' + imgSplit[0] + '" alt="' + imgSplit[1] + '" width="770" height="68" border="0" usemap="#Map">');